JPH06277733A - Hot rolling ceramic roller and roll - Google Patents
Hot rolling ceramic roller and rollInfo
- Publication number
- JPH06277733A JPH06277733A JP7345193A JP7345193A JPH06277733A JP H06277733 A JPH06277733 A JP H06277733A JP 7345193 A JP7345193 A JP 7345193A JP 7345193 A JP7345193 A JP 7345193A JP H06277733 A JPH06277733 A JP H06277733A
- Authority
- JP
- Japan
- Prior art keywords
- roller
- silicon nitride
- obtd
- vickers hardness
- hot rolling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Rolls And Other Rotary Bodies (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、条鋼、鋼管等を製造す
る熱間圧延ラインに使用されるガイドローラ及び圧延ロ
ールに係り、更に詳細には、所定特性を有する窒化珪素
材料を用いて成るガイドローラ及び圧延ロールに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide roller and a rolling roll used in a hot rolling line for manufacturing a steel strip, a steel pipe and the like, and more specifically, it is made of a silicon nitride material having predetermined characteristics. The present invention relates to guide rollers and rolling rolls.
【０００２】[0002]
【従来の技術】従来、条鋼、鋼管等を製造する熱間圧延
ラインに使用されるガイドローラや圧延ロール（以下、
ガイドローラ及び圧延ロールの双方を「ローラ」と略
す。）は、金属製のものが主流であった。しかし、金属
製ローラは摩耗が激しく短寿命であり、また、耐熱性も
不十分であるため被圧延物と接触して焼き付けが発生し
易いという問題があった。更に、重量が重いためローラ
の取り付けや交換作業も容易ではなかった。そこで、近
年、セラミックスの有する優れた耐摩耗性、耐熱性、軽
量性等の特性を利用したセラミックス製ローラの開発が
盛んに行われている。2. Description of the Related Art Conventionally, guide rollers and rolling rolls (hereinafter referred to as "rolling rolls" used in a hot rolling line for manufacturing bar steel, steel pipe, etc.
Both the guide roller and the rolling roll are abbreviated as “rollers”. ) Was mainly made of metal. However, there is a problem that the metal roller has a great wear and a short life and has insufficient heat resistance, so that the metal roller is liable to come into contact with the material to be rolled to cause baking. Further, since the weight is heavy, it is not easy to attach or replace the roller. Therefore, in recent years, development of ceramic rollers utilizing the excellent properties of ceramics such as wear resistance, heat resistance, and light weight has been actively made.
【０００３】例えば、特開昭６２−１０４６１６号公報
には、少なくとも被圧延材との接触面を気孔率１％以下
の緻密質の窒化珪素質セラミックスで形成し、該接触面
の面粗さを６S以下としたことを特徴とする圧延用ガイ
ドローラが開示されている。このローラは、被圧延材と
の接触面の粗さを限定することにより、被圧延材がロー
ラへ付着するのを防止する等の工夫がなされている。ま
た、ローラの構造材料として窒化珪素材料を使用するた
めには、強度を向上させるのが重要とされ、これらの特
性を向上させるために様々な工夫がなされてきた。For example, in Japanese Patent Laid-Open No. 62-104616, at least the contact surface with the material to be rolled is formed of dense silicon nitride ceramics having a porosity of 1% or less, and the surface roughness of the contact surface is determined. A rolling guide roller is disclosed, which is characterized in that it is 6 S or less. This roller has been devised so as to prevent the rolled material from adhering to the roller by limiting the roughness of the contact surface with the rolled material. Further, in order to use a silicon nitride material as the structural material of the roller, it is important to improve the strength, and various measures have been taken to improve these characteristics.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記の
ような従来のセラミックス製ローラにおいては、被圧延
材がローラへ付着するのを防止する点について改善性が
認められるものの、ローラ自体の強度（特に、耐熱衝撃
性）についての考慮が十分とは言えず、比較的短時間の
使用でローラが破損することがあるという課題があっ
た。また、強度を向上させた材料を使用してローラを構
成した場合にも、耐摩耗性については未だ十分とは言い
得ず、特にローラの寿命をも考慮した高温耐摩耗性につ
いては、一層改善の余地があった。However, in the conventional ceramic roller as described above, although the improvement in the point of preventing the material to be rolled from adhering to the roller is recognized, the strength of the roller itself (particularly , Thermal shock resistance) cannot be said to be sufficient, and there has been a problem that the roller may be damaged when used for a relatively short time. Further, even when the roller is formed by using a material having improved strength, it cannot be said that the wear resistance is still sufficient, and particularly the high temperature wear resistance considering the life of the roller is further improved. There was room for
【０００５】本発明は、このような従来技術の有する課
題に鑑みてなされたものであり、その目的とするところ
は、耐熱衝撃性及び耐摩耗性に優れ、製品寿命が延長さ
れたセラミックス製ローラを提供することにある。The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a ceramic roller which has excellent thermal shock resistance and abrasion resistance and has a long product life. To provide.
【０００６】[0006]
【課題を解決するための手段】本発明者は、上記課題を
解決すべく鋭意研究した結果、所定のビッカース硬度を
有する窒化珪素材料を用いることにより、上記課題が解
決できることを見出し本発明を完成するに至った。従っ
て、本発明の熱間圧延セラミックスローラは、熱間圧延
ラインに使用されるセラミックスローラであって、８０
０℃におけるビッカース硬度が９．０ＧＰａ以上の窒化
珪素材料を用いて構成されることを特徴とする。As a result of intensive studies to solve the above problems, the present inventor has found that the above problems can be solved by using a silicon nitride material having a predetermined Vickers hardness, and completed the present invention. Came to do. Therefore, the hot rolling ceramics roller of the present invention is a ceramics roller used in a hot rolling line,
It is characterized in that it is constituted by using a silicon nitride material having a Vickers hardness at 0 ° C. of 9.0 GPa or more.
【０００７】[0007]
【作用】本発明においては、ローラの作製に使用する窒
化珪素材料のビッカース硬度を、８００℃以上の温度範
囲において９．０ＧＰａ以上の値を有するように制御し
た。この特性条件は、本発明者が種々の材料の物性を様
々な測定方法で検査し、得られた結果と実際の圧延ライ
ンで試験して得られた結果とを比較検討することによ
り、得られた知見である。In the present invention, the Vickers hardness of the silicon nitride material used for producing the roller is controlled to have a value of 9.0 GPa or more in the temperature range of 800 ° C. or more. This characteristic condition is obtained by inspecting the physical properties of various materials by various measurement methods by the present inventor, and comparing the obtained results with the results obtained by testing on an actual rolling line. It is the knowledge.
【０００８】上述のような特性条件に制御することによ
り、ローラの耐熱衝撃性、耐摩耗性及び製品寿命が向上
できることの詳細は現時点では不明であるが、以下のよ
うに推論することができる。即ち、熱間圧延、特に８０
０℃以上の高温における熱間圧延の条件下においては、
ローラの耐摩耗性や耐熱衝撃性は、ローラ表面が有する
摩擦係数（表面粗度）のみに依存するものではなく、む
しろローラ自体の硬さに支配されるからであると考える
ことができる。The details that the thermal shock resistance, the wear resistance and the product life of the roller can be improved by controlling the above-mentioned characteristic conditions are not clear at present, but it can be inferred as follows. Hot rolling, especially 80
Under the conditions of hot rolling at a high temperature of 0 ° C. or higher,
It can be considered that the wear resistance and thermal shock resistance of the roller do not depend only on the friction coefficient (surface roughness) of the roller surface, but rather are governed by the hardness of the roller itself.
【０００９】なお、ローラの良好な製品寿命を保持しつ
つ、一層厳しい圧延条件下（例えば、被圧延材の温度を
一層高温にしたり、その送り速度を増大させる。）で優
れた耐摩耗性及び耐熱衝撃性を維持させるためには、上
記ビッカース硬度を１０００℃において、１０．０ＧＰ
ａ以上に制御するのが好ましい。但し、この条件は、上
記ビッカース硬度の条件（８００℃において９．０ＧＰ
ａ以上）を何ら制限するものではなく、通常は上記ビッ
カース硬度の条件で十分である。It should be noted that while maintaining a good product life of the roller, it has excellent wear resistance under more severe rolling conditions (for example, the temperature of the material to be rolled is further raised or its feeding speed is increased). In order to maintain the thermal shock resistance, the above Vickers hardness is set to 10.0 GP at 1000 ° C.
It is preferable to control to a or more. However, this condition is the Vickers hardness condition (9.0 GP at 800 ° C.
a or more) is not limited at all, and the above Vickers hardness condition is usually sufficient.
【００１０】[0010]
【実施例】以下、本発明を実施例に基づいて更に詳細に
説明する。 （実施例１〜６）窒化珪素粉末に焼結助剤を添加混合し
て得られた成形原料を、ラバープレス成形により円筒状
に成形した。得られた成形体を旋盤を用いて切削加工
し、目的とすべきローラの最終形状に焼成収縮及び焼成
後の切削加工代を見込んだニアネット形状に加工した。
この際、ローラ外周部に被圧延材案内用の溝部を設け
た。EXAMPLES The present invention will now be described in more detail based on examples. (Examples 1 to 6) A molding raw material obtained by adding and mixing a sintering aid to silicon nitride powder was molded into a cylindrical shape by rubber press molding. The obtained molded body was cut using a lathe, and the final shape of the desired roller was processed into a near-net shape that allows for firing shrinkage and a cutting allowance after firing.
At this time, a groove portion for guiding the material to be rolled was provided on the outer peripheral portion of the roller.
【００１１】次いで、得られた切削加工体をＮ2雰囲気
中で焼成し、得られた焼結体を更に切削加工（仕上げ加
工）して、最終形状寸法のローラを得た。なお、最終形
状のローラは、外径１００ｍｍφ、内径５０ｍｍφ、幅
５０ｍｍ、溝部の曲率Ｒ２０の形状を有する。Then, the obtained cut body was fired in an N 2 atmosphere, and the obtained sintered body was further cut (finished) to obtain a roller having a final shape and dimension. The final shape of the roller has an outer diameter of 100 mmφ, an inner diameter of 50 mmφ, a width of 50 mm, and a groove curvature R20.
【００１２】そして、上記工程で使用する焼結助剤の種
類、添加量及び焼成温度を変化させ、材料特性の異なる
窒化珪素製ローラ（実施例１〜６）を得た。このように
して得られた各ローラのビッカース硬度及びＪＩＳ Ｒ
１６０１に準拠した４点曲げ強度を測定し、得られた
結果を表１に示した。なお、上記ビッカース硬度は、Ｊ
ＩＳ Ｚ ２２４４「ビッカース硬さ試験方法」に準拠
して測定した。測定条件は、各測定温度で３０分間保持
して試料が所定の温度に達したことを確認した後、荷重
５ｋｇ、荷重保持時間３０ｓｅｃで行った。この際、測
定中の試料が酸化するのを防止するため、アルゴン雰囲
気中で測定を行った。また、各ローラを用いて、鋼材温
度、鋼材の送り速度等の圧延条件を変化させ、実際の熱
間圧延ラインで実機評価試験を行い、その際の圧延条件
及び評価結果を表２に示した。Then, the type, the amount of addition and the firing temperature of the sintering aid used in the above process were changed to obtain silicon nitride rollers (Examples 1 to 6) having different material properties. The Vickers hardness and JIS R of each roller thus obtained
The 4-point bending strength based on 1601 was measured, and the obtained results are shown in Table 1. The Vickers hardness is J
It was measured according to IS Z 2244 "Vickers hardness test method". The measurement conditions were such that each sample was held at each measurement temperature for 30 minutes to confirm that the sample reached a predetermined temperature, and then the load was 5 kg and the load holding time was 30 sec. At this time, in order to prevent the sample being measured from being oxidized, the measurement was performed in an argon atmosphere. Further, using each roller, the rolling conditions such as the steel material temperature and the feed rate of the steel material were changed, and an actual machine evaluation test was conducted on an actual hot rolling line. The rolling conditions and the evaluation results at that time are shown in Table 2. .
【００１３】（比較例１〜６）従来の熱間圧延装置に用
いられる超硬合金や耐熱合金製のローラを用いて、ビッ
カース硬度の測定、４点曲げ強度試験及び実機評価試験
を行い、得られた結果を表１及び表２に示す。ここで、
比較例１〜４は窒化珪素製のローラであり、比較例３の
ローラは気孔率が１％で表面粗度が６ｓである。また、
比較例５は超硬合金製、比較例６は耐摩耗合金製のロー
ラである。(Comparative Examples 1 to 6) Vickers hardness measurement, 4-point bending strength test and actual machine evaluation test were carried out using rollers made of cemented carbide or heat-resistant alloy used in conventional hot rolling equipment. The obtained results are shown in Tables 1 and 2. here,
Comparative Examples 1 to 4 are rollers made of silicon nitride, and the roller of Comparative Example 3 has a porosity of 1% and a surface roughness of 6s. Also,
Comparative Example 5 is a roller made of cemented carbide, and Comparative Example 6 is a roller made of wear-resistant alloy.
【００１４】[0014]
【表１】 [Table 1]
【００１５】[0015]
【表２】 [Table 2]
【００１６】表１及び表２に示す結果より、本発明の範
囲に属する実施例１〜６のローラが優れた性能を有する
ことがわかる。即ち、８００℃でのビッカース硬度が低
い場合（比較例１〜６）には、ローラの摩耗が大きく、
被圧延材の寸法が次第に大きくなった。特に、比較例５
及び６では、ローラに亀裂や破壊が発生し、これが被圧
延材（鋼材）の表面に転写され、鋼材の商品価値を失わ
しめた。From the results shown in Tables 1 and 2, it can be seen that the rollers of Examples 1 to 6 within the scope of the present invention have excellent performance. That is, when the Vickers hardness at 800 ° C. is low (Comparative Examples 1 to 6), the wear of the roller is large,
The dimension of the rolled material gradually increased. In particular, Comparative Example 5
In Nos. 6 and 6, cracks and breakage occurred in the roller, which were transferred to the surface of the material to be rolled (steel material), and the commercial value of the steel material was lost.
【００１７】なお、圧延条件が厳しい場合（鋼材温度が
高い及び／又は送り速度が速い場合）には、実施例５の
ように摩耗量が大きくなることがあるので、そのような
場合には、実施例６のように１０００℃でのビッカース
硬度を高くするのが好ましいこともわかる。When the rolling conditions are severe (the steel material temperature is high and / or the feed rate is fast), the wear amount may be large as in Example 5, and in such a case, It can also be seen that it is preferable to increase the Vickers hardness at 1000 ° C. as in Example 6.
【００１８】以上、本発明を実施例により説明したが、
本発明はこれら実施例に限定されるものではなく、本発
明の要旨の範囲内において種々の変形が可能である。例
えば、ローラの外周部に設けた溝部は必ずしも必須のも
のではない。また、ローラの形状・寸法等は用いる圧延
装置等に応じて適宜変更することができる。更に、圧延
条件に応じて、本発明のローラを熱間圧延のみならず冷
間圧延に用いることも可能である。更にまた、例えば、
低膨張金属製のスリーブ部材と組合わせて、外周部のみ
が本発明に係る窒化珪素材料を用いたローラを製造する
ことも可能である。The present invention has been described above with reference to the embodiments.
The present invention is not limited to these examples, and various modifications can be made within the scope of the gist of the present invention. For example, the groove portion provided on the outer peripheral portion of the roller is not always essential. Further, the shape and size of the roller can be appropriately changed depending on the rolling device used. Furthermore, depending on the rolling conditions, the roller of the present invention can be used not only for hot rolling but also for cold rolling. Furthermore, for example,
In combination with a sleeve member made of a low expansion metal, it is possible to manufacture a roller using only the outer peripheral portion of the silicon nitride material according to the present invention.
【００１９】[0019]
【発明の効果】以上説明したように、本発明によれば、
所定のビッカース硬度を有する窒化珪素材料を用いるこ
ととしたため、耐熱衝撃性及び耐摩耗性に優れ、製品寿
命が延長されたセラミックス製の圧延ロール及びガイド
ローラを提供することができる。As described above, according to the present invention,
Since the silicon nitride material having a predetermined Vickers hardness is used, it is possible to provide a ceramic rolling roll and guide roller which are excellent in thermal shock resistance and wear resistance and whose product life is extended.
フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｆ１６Ｃ 13/00 Ｅ 8613−3Ｊ Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location F16C 13/00 E 8613-3J
Claims (2)
スローラであって、８００℃におけるビッカース硬度が
９．０ＧＰａ以上の窒化珪素材料を用いて構成されるこ
とを特徴とする熱間圧延セラミックスローラ。1. A ceramic roller for use in a hot rolling line, which is made of a silicon nitride material having a Vickers hardness at 800 ° C. of 9.0 GPa or more.
０．０ＧＰａ以上の窒化珪素材料を用いて構成されるこ
とを特徴とする請求項１記載の熱間圧延セラミックスロ
ーラ。2. The Vickers hardness at 1000 ° C. is 1.
The hot-rolled ceramics roller according to claim 1, wherein the hot-rolled ceramics roller is made of a silicon nitride material of 0.0 GPa or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5073451A JP2586873B2 (en) | 1993-03-31 | 1993-03-31 | Hot rolled ceramics rollers and rolls |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5073451A JP2586873B2 (en) | 1993-03-31 | 1993-03-31 | Hot rolled ceramics rollers and rolls |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06277733A true JPH06277733A (en) | 1994-10-04 |
| JP2586873B2 JP2586873B2 (en) | 1997-03-05 |
Family
ID=13518614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5073451A Expired - Fee Related JP2586873B2 (en) | 1993-03-31 | 1993-03-31 | Hot rolled ceramics rollers and rolls |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2586873B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013166635A (en) * | 2012-02-16 | 2013-08-29 | Sumitomo Rubber Ind Ltd | Sheet conveying roller and production method therefor |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59197307A (en) * | 1983-04-22 | 1984-11-08 | Hitachi Ltd | Roll for rolling mill |
| JPS60200863A (en) * | 1984-03-21 | 1985-10-11 | 三菱マテリアル株式会社 | Silicon nitride base ceramics |
| JPS61103608A (en) * | 1984-10-25 | 1986-05-22 | Hitachi Metals Ltd | Ceramic rolling roll |
| JPS6416792A (en) * | 1987-06-19 | 1989-01-20 | Solvay | Guanidine related compound containing tetraphenylborate ion, its production and use thereof in peptide synthesis |
| JPH0521647A (en) * | 1991-07-11 | 1993-01-29 | Mitsubishi Electric Corp | Resin sealed type semiconductor device and manufacture thereof |
| JPH0558741A (en) * | 1991-09-04 | 1993-03-09 | Denki Kagaku Kogyo Kk | Silicon nitride ceramic sintered body |
-
1993
- 1993-03-31 JP JP5073451A patent/JP2586873B2/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59197307A (en) * | 1983-04-22 | 1984-11-08 | Hitachi Ltd | Roll for rolling mill |
| JPS60200863A (en) * | 1984-03-21 | 1985-10-11 | 三菱マテリアル株式会社 | Silicon nitride base ceramics |
| JPS61103608A (en) * | 1984-10-25 | 1986-05-22 | Hitachi Metals Ltd | Ceramic rolling roll |
| JPS6416792A (en) * | 1987-06-19 | 1989-01-20 | Solvay | Guanidine related compound containing tetraphenylborate ion, its production and use thereof in peptide synthesis |
| JPH0521647A (en) * | 1991-07-11 | 1993-01-29 | Mitsubishi Electric Corp | Resin sealed type semiconductor device and manufacture thereof |
| JPH0558741A (en) * | 1991-09-04 | 1993-03-09 | Denki Kagaku Kogyo Kk | Silicon nitride ceramic sintered body |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013166635A (en) * | 2012-02-16 | 2013-08-29 | Sumitomo Rubber Ind Ltd | Sheet conveying roller and production method therefor |
| US10099405B2 (en) | 2012-02-16 | 2018-10-16 | Sumitomo Rubber Industries, Ltd. | Sheet conveying roller and production method therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2586873B2 (en) | 1997-03-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5072689A (en) | Continuous hot-dip plating apparatus | |
| US6202463B1 (en) | Plug and mandrel bar for seamless steel pipe rolling operation for manufacturing seamless steel pipe | |
| KR0145548B1 (en) | Ceramic-made guide for rolling line | |
| JP2586873B2 (en) | Hot rolled ceramics rollers and rolls | |
| US4756180A (en) | Method of hot rolling for iron and iron alloy rods | |
| US5600867A (en) | Car kiln wheel having silicon nitride rotating members | |
| JP4314884B2 (en) | Mandrel bar for hot seamless pipe rolling | |
| JPH06170419A (en) | Ceramic roller and manufacture therefor | |
| JPS61266357A (en) | Ceramic tool for worm or hot forging | |
| JPH0246541B2 (en) | ||
| JPH01299723A (en) | Mechanical expander cone | |
| JP2920138B1 (en) | Ceramic jig for hot rolling line | |
| JP2006297428A (en) | Reeler plug for producing seamless tube | |
| JPH06179005A (en) | Combined construction roller | |
| CN214391684U (en) | C-shaped sliding rail hot extrusion molding system | |
| JP3657110B2 (en) | High-hardness cold tool steel for pre-hardened with excellent wear resistance and machinability | |
| JP2693364B2 (en) | Ceramic rotating jig | |
| JP2000351671A (en) | Particle-dispersed silicon carbide-based sintered product and guide roller which use the same and is used for rolling wire rod | |
| JPH0742562B2 (en) | Roll for continuous molten metal plating and apparatus using the same | |
| US4044582A (en) | Work guide for pipe reeling machines and the like and process for treating the same | |
| SU1592081A1 (en) | Method of producing outer races of bearings of symmetric profile | |
| JPH01130807A (en) | Guide roller for rolling of metal bar stock | |
| JPS59225805A (en) | Tool for forming seamless steel pipe | |
| JPH09278523A (en) | Wire-mill guide roller made of sintered silicon carbide containing dispersed particle | |
| JP2000263116A (en) | Ceramics-made roller for conveying |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19961022 |
|
| LAPS | Cancellation because of no payment of annual fees |